Top 10 Chinese cities with worst air quality
Updated: 2014-03-20 07:46 (chinadaily.com.cn)Xi'an
Xi'an is the capital of Shaanxi province, and a sub-provincial city of China. With more than 3,100 years of history, it is also one of the oldest cities in China.
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 Xi'an in Shaanxi province. [Photo / Image China]
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